Bebop and Rocksteady are some of this year's most popular characters. Get the look of your favorite movie villain with the help of this Rocksteady mask. From the 2016 film, Teenage Mutant Ninja Turtles Out of the Shadows, you can bring the mutated rhino to life with the help of this incredible TMNT Rocksteady mask. Pair it with your costume and get ready to take on the TMNT!